Malicious PDF — malware analysis report

Static analysis result for SHA-256 7464d56083e9e703…

MALICIOUS

PDF

71.4 KB Created: 2021-09-08 16:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8335771a1d219a67be3a98228c8ebdd6 SHA-1: bbec638fc6cce36853008afe4ec12ca0e4efc9bf SHA-256: 7464d56083e9e703741738e86183b57f0c79f91c00420a5d08b8ff32eca23fc6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to domains that appear to be part of a link farm or disposable hosting, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://i-akparat.kz/ckfinder/userfiles/files/11226185064.pdf In PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/20176294432.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/bosufuzas.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/99645633375.pdfIn PDF document text
    • https://ever-progress.com/upload/files/ramono.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/6821235547.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/27507186976.pdfIn PDF document text
    • https://orrizon.ru/images/file/41511897938.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/31196033761.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/96174494073.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/rolavebiwuru.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/zalosurajasolumepemafu.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/luxojuguxagedawabatigix.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/xadifuvama.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/pemawomata.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_04_03_01_35_6840.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/82230327382.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/92713374452.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/ropuxus.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/xopeda.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/vopomidikemakex.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/56230292494.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161301ba7dbb1d---bagukazafobugadepitiwokap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=scanned+image+pdf+to+jpgPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DE 16244 bytes
SHA-256: 7e555ce22f4987d06d66bffbc3ec67afa6359fa56a085f146b1c7e931efb8a29
font_01_sfnt_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 10856 bytes
SHA-256: 228b5f41b7ed80b3498654530965700d95da63d9f9bfbb5ba333f8594a14e69a